Hertfordshire · England
Broad Colney New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Broad Colney. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Joints pulling apart as timber shrinks
- Cracked sealant around new window and door frames
- Worktop and upstand sealant coming away
Looking after it afterwards
After the cure time, these simple habits help:
- Report sealant problems to your builder during the snagging period
- Keep water off fresh sealant until it has cured
- Ventilate bathrooms well, especially in the first year
- Act quickly if a seal starts to leak
Do not stand on the bath edge or the lip of the tray. Report any movement in a bath or tray.
Report failed sealant to the builder while you are in the snagging period. After that, putting it right may fall to you.
New build mastic in Broad Colney, done properly
Building dust is behind a lot of failed new-build sealant. Each joint is cleaned of dust and primed where the product calls for it, so the sealant actually sticks. We work on bathrooms & en suites, show homes and windows & doors, and the jobs we see most are cracks appearing as a new home settles and messy sealant that spoils new finishes.
Somewhere as small as Broad Colney, new homes tend to be conversions, self-builds or a few houses rather than an estate. Every one needs its sealant and floor joints done properly, whatever the size of the site.
Every job is covered by a one-year guarantee.
- Location
- Broad Colney (AL2)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Broad Colney
Other services in Broad Colney
What happens on the day
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for most snagging lists, longer for a run of plots and we leave things clean and tidy. In a small place like Broad Colney, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We go through the snagging list or plot schedule and agree the joints to do.
- We cut out every bit of the failed or messy sealant.
- We clean off dust from the build and prime the surfaces where the product needs it.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Before we arrive
- Clear the area around the work
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
Get a quote
If you are in Broad Colney and need new build mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
What sealant work cannot fix
A few problems are outside what sealant work can do:
- Plumbing faults behind the sealant
- A tray or bath that isn’t properly supported, until it’s fixed
- Broken tiles or a split tray
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Plot handovers
- Kitchens
- Windows & doors
- Show homes
- Bathrooms & en suites
- Skirting & floors
Your questions about new build mastic in Broad Colney
Can you help a landlord with a rental near Park Street station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Do you cover Broad Colney for new build mastic?
Yes. We work across London and the South East, and Broad Colney is part of that. You can call 0345 464 0079 or email us and let us know what needs doing.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can you match the sealant colour to my new kitchen or bathroom?
White and clear are the most common, but sealant comes in other colours too. We choose one to suit the room before we begin.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Can I send you my snagging list?
Yes. Snagging lists are a common starting point for us. We’ll go through the sealant items and agree what we will do.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Joints and finishes in Broad Colney homes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around Broad Colney, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Broad Colney is about 3 miles south-east of St Albans, in Hertfordshire. From the centre of Broad Colney to the outskirts, new build mastic is available for homes and businesses alike. 381 places in Hertfordshire are on our list, from the larger towns to small villages. London is on our list too, about 17 miles from Broad Colney.
Jobs for new build mastic in AL2 is quoted and booked the same way as anywhere else. We also cover the places around Broad Colney: London Colney (1 mile north), Shenleybury (1 mile south-east), Tyttenhanger (2 miles north), Sleapshyde (3 miles north-east) and Colney Heath (3 miles north-east). Within a short drive, we also cover Watford (6 miles south-west), Hemel Hempstead (7 miles west), Stevenage (14 miles north), St Albans (3 miles north-west), Welwyn Garden City (7 miles north-east) and Harpenden (7 miles north).
Around Broad Colney
Around Broad Colney, our work takes us to homes and buildings near The White Lion pub and Samuel Ryder Academy, among other places. For rail, the closest station is Park Street station, about 1.9 miles north-west of the centre. Other landmarks nearby include Hilfield Castle (4.5 miles south) and Radlett and District Museum (2.5 miles south). Not far away are Verulamium Lake and Broad Colney Lakes.
Signs you need new build mastic in Broad Colney
A new house holds a lot of water from the build, and it dries out over the first couple of years. Drying timber shrinks and pulls joints apart and the sealant has to cope with the movement.
Keep an eye out for these signs:
- Messy sealant that spoils new finishes
- Worktop and upstand sealant coming away
- Joints pulling apart as timber shrinks
- Internal frame sealant that has split
If you’ve bought a new home near Park Street station, the sealant around baths, showers and frames is worth checking in the first year or two.
Before you book anyone
- How much experience the applicator has
- What preparation is included
- What the cure time is
- Whether you can choose the colour
What happens if it’s left?
A tube of sealant from the DIY shop will not fix the cause: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. In a small place like Broad Colney, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- Quality sealants from Arbo and Everbuild
- Approved under the ARBOMaster scheme
- We are fully insured
Read how sealant jobs are priced or our reviews.
Quotes for new build mastic in Broad Colney
Jobs vary more than people expect. What affects the quote:
- Whether there’s mould to deal with
- Whether the work is at height
- The old material and how stubborn it is
- How many areas need sealing
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
- Any access issues, like height or stairs
- Photos by email, if that is easy
Want a quote for new build mastic? Please ring 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.